Which of the following elements is a trace element that is essential to life?
A) phosphorus
B) carbon
C) iron
D) calcium
Correct Answer:
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Q3: An atom's _ are found in its
Q4: All atoms of an element have the
Q5: What are the four most common elements
Q6: Sulfur has an atomic number of 16.
Q7: Adjacent water molecules interact with one another
Q9: Why is water considered a polar molecule?
A)The
Q10: The bond between oppositely charged ions is
Q11: In order to have a positive charge,
Q12: _ is an example of an element.
A)Water
B)Nitrogen
C)Glucose
D)Salt
Q13: What name is given to bonds that
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